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Trojan.DNSHijacker & Backdoor.Frauder


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I have a couple of questions about the nature of the two captioned items. I downloaded IObit Security 360 to scan my computer because it was recommended by CNET for bots. I had been receiving spam emails from my own Yahoo email address and I suspected my computer was infected with something. However I had never run my machine without a firewall and anti-virus software, and other security software failed to detect anything. I had scanned my machine with AVG, Microsoft Security Suite, Microsoft Malware Remover, PC Tools software, and others. All said my computer was clean. But the IObit 360 found a couple of severe threats on my machine, noted above. They were removed, and yet I continued to receive spam emails from myself - which appeared to actually be coming from my own email not just made to look like they were. I read that if your computer has been turned into a "zombie" it can be almost impossible to fix. So I finally gave up and reformatted my hard drive, wiped it clean and reloaded all my software -- since I did that I have not received any spam email from myself. Thus I'm pretty sure my machine had been turned into a "zombie". My questions are: How did it happen when I was running good security software on my computer? What do the captioned viruses/malware actually do on the computer? Do they cause it to send spam? Do they do even worse things like collect personal data and send it somewhere? Any assistance would be appreciated. I do not have experience with this stuff. I have printouts of the scan which detected these items, but I do not have the electronic copy of it because as noted I have since reformatted my hard drive.

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Welcome to the forums, beckicat :-)


I can address some of your questions, but I won't be able to tell you everything because we would have needed scans from tools you are not familiar with, in order to "see" what was actually there.


1) DNS hijack are common infections in the wild. They basically change your DNS so that your searches are redirected to sites affiliated with organized crime ; someone makes money everytime you are redirected. No backdoor or zombie effect there.


2) Malware classified as "Frauder" (backdoor) are a different beast altogether. Yes, they install a backdoor on your machine which allows a remote computer (or Botnet) to do practically anything they want with your machine. Spamming, attacking web sites, distributing more malware from your machine or worse, some highly illegal material like child porn may transit from a zombie computer, without your knowledge... And yes, a backdoor can also allow retrieval of all information/data/passwords etc... from your machine.




Malware removal on forums can, most times and if done right, remove most if not all of these pests. Safely and cleanly.


Most infections nowadays come from cracks, peer-to-peer networks (including torrents) or fake movie codecs / viewers found on high risk sites. Safe surfing habits beat any antivirus, firewall or anti-malware programs. A fresh piece of malware may elude many antivirus programs for a few days, when they start circulating, so you are never completely safe.


That's about all I can say. I hope I have answered some of your questions ;-)



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